Evaporator of active substances



FIG. 1 is a front perspective view of an evaporator of active substances of the design of the present invention;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation thereof;

FIG. 4 is a right side elevation thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a left side elevation thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for an evaporator of active substances, as shown and described. 